four shootings. >> because the question he owned is forensically linked to those crimes. >> on what appears to be his face book page aaron is shooting a gun. drivers like robert mcdonald narrowly escaped being struck behind the wheel. >> reporter: but even with the arrest, police are still on the lookout. ballistics, can connect allen to only four of the highway shootings in phoenix. police still asking the public for their help. now still ahead, foreign policy dominated the foreign policy debate but to the candidates showed very little authority on the issues. cannot be controlled. when a wildfire raged through elkhorn ranch,